.page-articles {
  --kb-rail-col: 40px;
  --kb-rail-track: color-mix(in srgb, var(--color-ink) 14%, transparent);
}

/* ================= 首屏 ================= */
.page-articles .kb-hero {
  position: relative;
  overflow: hidden;
  background: var(--color-surface);
}

.page-articles .kb-hero__media {
  position: relative;
  height: 200px;
  overflow: hidden;
  background: var(--color-contrast-surface);
}

.page-articles .kb-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-articles .kb-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
}

.page-articles .kb-hero__inner {
  padding-top: var(--space-6);
  padding-bottom: var(--space-8);
}

.page-articles .kb-hero__stack {
  display: grid;
  gap: var(--space-4);
  margin-top: var(--space-4);
}

/* 分类轨道 */
.page-articles .kb-rail {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-articles .kb-rail__item {
  display: inline-flex;
  align-items: baseline;
  gap: var(--space-1);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.12em;
  color: var(--color-ink-soft);
}

.page-articles .kb-rail__count {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
}

.page-articles .kb-hero__lead {
  min-width: 0;
}

.page-articles .kb-hero__title {
  margin: var(--space-3) 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-articles .kb-hero__lede {
  max-width: 42ch;
  margin: 0;
}

/* 首屏数字组 */
.page-articles .kb-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-4);
  margin: var(--space-6) 0 0;
  padding: 0;
}

.page-articles .kb-stats__cell {
  min-width: 0;
}

.page-articles .kb-stats__label {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.page-articles .kb-stats__value {
  display: inline-block;
  margin: var(--space-1) 0 0;
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  line-height: 1.2;
  color: var(--color-ink);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-articles .kb-stats__unit {
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-articles .kb-stats__cell--key .kb-stats__value {
  padding-bottom: 2px;
  border-bottom: 2px solid var(--color-primary);
}

/* ================= 条目流 ================= */
.page-articles .kb-stream {
  padding-top: var(--space-8);
}

.page-articles .kb-stream .eyebrow {
  margin-bottom: var(--space-6);
}

.page-articles .kb-entry {
  padding: var(--space-6) 0;
}

.page-articles .kb-entry__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--space-2);
}

.page-articles .kb-entry__index {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
}

.page-articles .kb-entry__body {
  min-width: 0;
}

.page-articles .kb-entry__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: var(--space-1) var(--space-3);
  margin: 0;
}

.page-articles .kb-entry__cat {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-soft);
  background: var(--color-surface-alt);
  padding: 3px 10px;
  border-radius: var(--radius-lg);
}

.page-articles .kb-entry__batch {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.page-articles .kb-entry__len {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.page-articles .kb-entry__title {
  margin: var(--space-2) 0 var(--space-2);
  max-width: 34ch;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

.page-articles .kb-entry__excerpt {
  max-width: var(--measure);
  margin: 0 0 var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-articles .kb-entry__more {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: 0;
  background: none;
  border: 0;
  border-bottom: 1px solid var(--color-line);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-ink);
  cursor: pointer;
  transition: border-color 240ms ease-out, color 240ms ease-out;
}

.page-articles .kb-entry__more:hover,
.page-articles .kb-entry__more:focus-visible {
  border-bottom-color: var(--color-primary);
}

.page-articles .kb-entry__more:focus-visible {
  outline: 1px solid var(--color-focus);
  outline-offset: 2px;
}

.page-articles .kb-entry__panel {
  max-width: var(--measure);
  margin-top: var(--space-3);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

.page-articles .kb-entry__panel p {
  margin: 0;
}

.page-articles .kb-entry__panel:not([hidden]) {
  animation: kbArticlesFadeIn 320ms ease-out both;
}

.page-articles .kb-entry__panel a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--color-primary);
}

/* 呼吸段 */
.page-articles .kb-breath {
  max-width: 40ch;
  margin: 0;
  padding: var(--space-6) 0 var(--space-4);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  line-height: 1.9;
  letter-spacing: 0.02em;
  color: var(--color-ink-soft);
}

.page-articles .kb-plate {
  margin: var(--space-4) 0 var(--space-6);
  max-width: 680px;
}

/* ================= 署名与校对 ================= */
.page-articles .kb-credit__grid {
  display: grid;
  gap: var(--space-6);
}

.page-articles .kb-credit__title {
  margin: var(--space-2) 0 var(--space-4);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-articles .kb-credit__copy .prose + .prose {
  margin-top: var(--space-3);
}

.page-articles .kb-credit__copy .prose a {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--color-primary);
}

.page-articles .kb-credit__fig {
  margin: 0;
}

/* ================= 延伸 ================= */
.page-articles .kb-beyond {
  padding-bottom: var(--space-8);
}

.page-articles .kb-beyond__grid {
  display: grid;
  gap: var(--space-6);
}

.page-articles .kb-beyond__fig {
  margin: 0;
  max-width: 420px;
}

.page-articles .kb-beyond__title {
  margin: var(--space-2) 0 var(--space-3);
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.page-articles .kb-beyond__list {
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}

.page-articles .kb-beyond__item {
  padding: var(--space-3) 0;
}

.page-articles .kb-beyond__link {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  letter-spacing: 0.06em;
  color: var(--color-ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 240ms ease-out;
}

.page-articles .kb-beyond__link:hover,
.page-articles .kb-beyond__link:focus-visible {
  border-bottom-color: var(--color-primary);
}

.page-articles .kb-beyond__link:focus-visible {
  outline: 1px solid var(--color-focus);
  outline-offset: 2px;
}

.page-articles .kb-beyond__desc {
  display: block;
  max-width: var(--measure);
  margin-top: var(--space-1);
  font-size: var(--text-sm);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
}

/* ================= 响应式 ================= */
@media (min-width: 760px) {
  .page-articles .kb-entry__head {
    grid-template-columns: 56px minmax(0, 1fr);
    gap: var(--space-4);
  }

  .page-articles .kb-entry__index {
    font-size: var(--text-base);
    line-height: 1.6;
  }
}

@media (min-width: 900px) {
  .page-articles .kb-hero__media {
    position: absolute;
    top: 0;
    right: 0;
    width: 44%;
    height: 100%;
    clip-path: polygon(28% 0, 100% 0, 100% 100%, 0 100%);
  }

  .page-articles .kb-hero__inner {
    position: relative;
    z-index: 1;
    padding-top: var(--space-8);
    padding-bottom: var(--space-8);
  }

  .page-articles .kb-hero__stack {
    grid-template-columns: var(--kb-rail-col) minmax(0, 1fr);
    gap: var(--space-6);
    margin-top: var(--space-6);
    padding-right: 42%;
  }

  .page-articles .kb-rail {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: var(--space-6);
    padding-top: var(--space-1);
  }

  .page-articles .kb-rail__item {
    writing-mode: vertical-rl;
    letter-spacing: 0.22em;
    align-items: center;
  }

  .page-articles .kb-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    max-width: 620px;
  }

  .page-articles .kb-entry {
    padding: var(--space-8) 0;
  }

  .page-articles .kb-credit__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 400px);
    gap: var(--space-8);
    align-items: start;
  }

  .page-articles .kb-credit__fig {
    margin-top: var(--space-6);
  }

  .page-articles .kb-beyond__grid {
    grid-template-columns: minmax(0, 360px) minmax(0, 1fr);
    gap: var(--space-8);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-articles .kb-beyond__grid {
    grid-template-columns: minmax(0, 400px) minmax(0, 1fr);
  }
}

@keyframes kbArticlesFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-articles .kb-entry__panel:not([hidden]) {
    animation: none;
  }
  .page-articles .kb-entry__more,
  .page-articles .kb-beyond__link {
    transition: none;
  }
}